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Make sure endmill flutes extend out of toolholder

Last Updated: Nov 03, 2016 01:28PM EDT

It is best practice not to allow any of the endmill flutes or washout (the material removed by the grinding wheel that extend beyond the end of the length of cut) to be inside the bore of the toolholder or collet. Cutting forces in one direction create a stress concentration at the intersection of the endmill and the toolholder on the opposite side. If the endmill is projected properly, the full diameter of the endmill allows for maximum resistance to this stress concentration. If the flutes or washout are at this intersection, a much smaller cross-section mass provides less resistance to stress and breakage is more likely.

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